CN109579879B - Position detection, drive, lens drive, optical, photographic device, and electronic apparatus - Google Patents
Position detection, drive, lens drive, optical, photographic device, and electronic apparatus Download PDFInfo
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- CN109579879B CN109579879B CN201710896854.6A CN201710896854A CN109579879B CN 109579879 B CN109579879 B CN 109579879B CN 201710896854 A CN201710896854 A CN 201710896854A CN 109579879 B CN109579879 B CN 109579879B
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- hall element
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
- G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Lens Barrels (AREA)
- Camera Bodies And Camera Details Or Accessories (AREA)
- Studio Devices (AREA)
- Measuring Magnetic Variables (AREA)
- Adjustment Of Camera Lenses (AREA)
Abstract
The invention provides a position detecting device, a driving device, a lens driving device, a camera device and an electronic device, which have good temperature characteristics and can be miniaturized. The position detection device (56) comprises a Hall element (54) which moves together with a drive coil (46) relative to a position detection magnet, a current supply circuit which is overlapped with the drive current and supplies a predetermined alternating current to the drive coil (46), and a control circuit which outputs an alternating current signal of the Hall element corresponding to the predetermined alternating current and controls the alternating current signal to a constant value.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to a position detection device, a driving device, a lens driving device, an optical device, a camera device, and an electronic apparatus.
[ background of the invention ]
Position detecting devices using hall elements have been known. However, since the output variation due to temperature is large, the output variation due to temperature is suppressed by disposing a temperature sensor (patent document 1) or disposing a plurality of hall elements (patent document 2).
[ Prior art documents ]
[ patent document ]
[ patent document 1 ] JP patent publication 2013-205550A
[ patent document 2 ] JP patent publication 2013-083597A
[ summary of the invention ]
[ problem to be solved by the invention ]
The traditional position detection device has a large number of sensors and is difficult to miniaturize.
The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a position detecting device, a driving device, a lens driving device, an optical device, a camera, and an electronic apparatus, which have excellent temperature characteristics and can be miniaturized.
[ technical solution ] A
One aspect of the present invention is a position detection device including a hall element that moves together with a drive coil relative to a position detection magnet, and a current supply circuit that is overlapped with a drive current and supplies a predetermined alternating current to the drive coil; the hall element is provided with a control circuit for outputting an alternating current signal corresponding to the predetermined alternating current to the hall element and controlling the alternating current signal to a constant value.
Specifically, the control circuit controls a bias current supplied to the hall element or controls an output voltage output from the hall element based on an ac signal output from the hall element.
Preferably, the control circuit separates the output of the alternating current signal from the signal output of the hall element, and feeds back the separated output of the alternating current signal.
Specifically, the control circuit includes a band-pass filter, a detector circuit, and a variable amplification factor amplifier circuit, and the output of the hall element is input to the detector circuit as an ac signal output from the hall element by the band-pass filter, and the output of the detector circuit is fed back by the variable amplification factor amplifier circuit.
Another aspect of the present invention is a driving device including a driving magnet, a driving coil facing the driving magnet, a hall element moving together with the driving coil relative to a position detection magnet, a current supply circuit overlapping with a driving current and supplying a predetermined alternating current to the driving coil, and a control circuit outputting an alternating current signal of the hall element corresponding to the predetermined alternating current to be controlled to a constant value.
Another aspect of the present invention is a lens driving device or an optical device including a driving magnet, a driving coil facing the driving magnet, the driving magnet or the driving coil being fixed, a lens support body supporting a lens or an optical element support body supporting an optical element, a hall element moving together with the driving coil relative to a position detection magnet, a current supply circuit overlapping with a driving current and supplying a predetermined alternating current to the driving coil, and a control circuit outputting an alternating current signal of the hall element corresponding to the predetermined alternating current to be controlled to a constant value.
Another aspect of the present invention is a camera apparatus including the lens driving device. Another aspect of the present invention is an electronic device including the camera.
According to the present invention, a drive current and a predetermined alternating current flow through a drive coil, and an alternating current signal of the hall element corresponding to the predetermined alternating current is output and controlled to a constant value, whereby a change in sensitivity of the hall element can be corrected without providing a temperature sensor or a plurality of hall elements. Therefore, a position detecting device, a driving device, a lens driving device, an optical device, a camera device, and an electronic apparatus, which have excellent temperature characteristics and can be miniaturized, can be provided.
[ description of the drawings ]
Fig. 1 is an oblique view of a photographic apparatus embodying the embodiment of the present invention.
FIG. 2 is an oblique view of a cut-away portion of a driving device according to an embodiment of the present invention.
Fig. 3 is a perspective view of a drive magnet, a drive coil, and a hall element applied to an embodiment of the present invention.
Fig. 4 is a block diagram of a position detection device according to embodiment 1 of the present invention.
Fig. 5 is a block diagram of a position detection device according to embodiment 2 of the present invention.
[ detailed description ] embodiments
Embodiments of the present invention will be described below with reference to the drawings.
Fig. 1 shows a camera 10 according to an embodiment of the present invention.
In addition, in this specification, the optical axis direction of the photographic apparatus 10 is referred to as the Z direction, and directions that intersect the optical axis direction perpendicularly and mutually perpendicularly are referred to as the X direction and the Y direction.
The camera apparatus 10 has an autofocus unit 12, and a driving apparatus 14 that drives the autofocus unit. The drive device 14 has a link mechanism 16 and a drive mechanism 18.
The autofocus unit 12 is formed in a square rectangular parallelepiped shape when viewed from the Z direction. As is well known, the autofocus unit 12 includes a lens unit therein, which is vertically held by a spring in the Z direction, and is moved up and down in the Z direction by a driving unit including a magnet, a coil, a yoke, and the like, thereby adjusting the position of the lens unit in the Z direction.
The link mechanism 16 couples the fixed body-side member 20 and the movable body-side member 22.
The fixed body side member 20 includes a base 24 formed in a rectangular frame shape. The moving-body-side member 22 also includes a moving-body holding portion 26 formed in a rectangular frame shape.
The autofocus unit 12 is held by the moving body holding portion 26 by fixing the lower surface outer periphery of the autofocus unit 12 to the upper surface inner periphery of the moving body holding portion 26.
The fixed body side member 20 includes a fixed body side protrusion 28 formed integrally with the base 24 at an outer edge portion. The fixed body-side projecting portion 28 is formed to project upward in the Z direction on 4 side portions of the base 24.
On the other hand, the movable body-side member 22 includes a movable body-side protrusion 30 formed integrally with the movable body holding portion 26 at an outer edge corner portion. The moving body side protrusion 30 protrudes in a direction at 45 degrees to the X direction and the Y direction at 4 corners of the moving body holding portion 26.
The link mechanism 16 includes 4 intermediate links 32a to 32d, 8 1 st active links 34a to 34h, and 82 nd active links 36a to 36h that are circularly arranged at intervals of 90 degrees around an imaginary circle having the optical axis as the center.
The 4 intermediate links 32a to 32d are formed in a rod shape corresponding to 4 sides of the base 24 and the movable body holding portion 26.
The 8 1 st active links 34a to 34h link the fixed body-side projecting portion 28 of the fixed body-side member 20 and the intermediate links 32a to 32d in the Z direction. That is, the 2 1 st active links 34a, 34b couple the fixed body-side projecting portion 28 and the intermediate link 32a of the fixed body-side member 20 to both ends of the fixed body-side projecting portion 28 of the fixed body-side member 20, the 2 1 st active links 34c, 34d couple the fixed body-side projecting portion 28 and the intermediate link 32b of the fixed body-side member 20 to both ends of the fixed body-side projecting portion 28 of the fixed body-side member 20, the 2 1 st active links 34e, 34f couple the fixed body-side projecting portion 28 and the intermediate link 32c of the fixed body-side member 20 to both ends of the fixed body-side projecting portion 28 of the fixed body-side member 20, and the 2 1 st active links 34g, 34h couple the fixed body-side projecting portion 28 and the intermediate link 32d of the fixed body-side member 20 to both ends of the fixed body-side projecting portion 28 of the fixed body-side member 20.
The 82 nd active links 36a to 36h link the moving body side protrusion 30 and the intermediate links 32a to 32d of the moving body side member 22 in the Z direction. That is, the 2 nd active links 36a, 36b connect the moving body side protruding portion 30 and the intermediate link 32a of the moving body side member 22 to both ends of the intermediate link 32a, the 2 nd active links 36c, 36d connect the moving body side protruding portion 30 and the intermediate link 32b of the moving body side member 22 to both ends of the intermediate link 32b, the 2 nd active links 36e, 36f connect the moving body side protruding portion 30 and the intermediate link 32c of the moving body side member 22 to both ends of the intermediate link 32c, and the 2 1 st active links 36g, 36h connect the moving body side protruding portion 30 and the intermediate link 32d of the moving body side member 22 to both ends of the intermediate link 32 d.
The movable body-side member 22 is supported by the link mechanism 16 with a predetermined space in the Z direction with respect to the fixed body-side member 20. The length of each of the 1 st active links 34a to 34h and the length of each of the 2 nd active links 36a to 36h are set to be equal to each other.
As shown by the 1 st active link 34h and the 2 nd active link 36h in fig. 2 as a representative, the 1 st active link 34a to 34h and the 2 nd active link 36a to 36h are constituted by a 1 st joint 38 connected to the fixed body-side member 20 or the movable body-side member 22, a 2 nd joint 40 connected to the intermediate links 32a to 32d, and a coupling portion 42 coupling the 1 st joint 38 and the 2 nd joint 40. The connecting portion 42 is cylindrical, but the 1 st connecting portion 38 and the 2 nd connecting portion 40 have notches on both side surfaces thereof and are thinner than the connecting portion 42. Therefore, the swing is easy in the notch direction and is difficult in the direction perpendicular to the notch direction. That is, the 1 st active links 34a to 34h and the 2 nd active links 36a to 36h respectively include an easy-to-move shaft and a difficult-to-move shaft. That is, the 1 st link 38 and the 2 nd link 40 are formed thinner in the easy movement axis direction than in the hard movement axis direction.
The 1 st active links 34a, 34b, 34e, and 34f are axes that are easy to move in the X direction and axes that are difficult to move in the Y direction. The 1 st active links 34c, 34d, 34g, and 34h have axes in the X direction that are difficult to move and axes in the Y direction that are easy to move. The 2 nd active links 36a, 36b, 36e, and 36f are axes that are difficult to move in the X direction and easy to move in the Y direction. The 2 nd active links 36c, 36d, 36g, and 36h are axes that are easy to move in the X direction and axes that are difficult to move in the Y direction.
Therefore, the easy movement axis and the difficult movement axis of the 1 st active links 34c and 34d connected to the adjacent intermediate links, for example, the 1 st active links 34a and 34b and the 1 st active links 32a and 32b, intersect perpendicularly. Similarly, for example, the movable axes and the immovable axes of the 2 nd movable links 36a and 36b and the 2 nd movable links 36c and 36d connected to the intermediate link 32a and the intermediate link 32b intersect perpendicularly, respectively, in the 2 nd movable links 36a to 36 h.
On the other hand, the movable axes and the immovable axes of the 1 st and 2 nd active links 34a and 36b, respectively, connected to the same intermediate link, for example, the intermediate link 32a, intersect perpendicularly. For example, the movable axes of the 1 st active link 34a, 34b and the movable axes of the 2 nd active link 36c, 36d connected to the adjacent intermediate link 32b of the intermediate link 32a to which the 1 st active link 34a, 34b is connected are parallel to each other.
The drive mechanism 18 includes a drive magnet 44 and a drive coil 46. The drive magnet 44 is also used as a position detection magnet. The drive magnets 44 and the drive coils 46 are paired, and 4 sets are provided corresponding to the link mechanism 16. As shown in fig. 3, the drive magnet 44 is formed by stacking 2 magnet pieces 44a and 44b formed in a plate shape. One magnet piece 44a (or 44b) is magnetized in the + Z direction, and the other magnet piece 44b (or 44a) is magnetized in the-Z direction. The magnets 44 are attached to the lower surfaces of the intermediate links 32a to 32d and disposed between the intermediate links 32a to 32d and the fixed body side member 20. Further, the drive magnets 44 are disposed between the 1 st active links 34a and 34b and between the 2 nd active links 36a and 36b on the same intermediate link, for example, the intermediate link 32 a.
The driving coil 46 is fixed to the upper surface of the aforementioned stationary body-side projecting portion 28. As shown in fig. 3, the coil 46 is composed of 2 parallel linear portions and a semicircular portion connecting the linear portions, and the linear portion of the drive coil 46 faces the lower surface of the drive magnet 44.
A yoke insertion hole 50 is formed in the side surface of the fixed body-side projecting portion 28 in the vertical direction. The yoke insertion hole 50 is inserted and fixed with a yoke 52 made of a magnetic body. Therefore, the magnetic lines of force generated by the magnet 44 pass through the coil 46, pass through the coil 46 again via the yoke 52, and return to the magnet 44.
The yoke 52 attracts the intermediate links 32a to 32d while strengthening the magnetic field applied from the drive magnet 44 to the drive coil 46, and maintains the center of the base 24 connected in a rectangular frame shape as the center of the optical axis.
The drive coil 46 has a hall element 54 mounted on its inner periphery as a position detecting means. The hall elements 54 are provided 1 in each of the X direction and the Y direction. However, 2 hall elements may be provided in the X direction and the Y direction, respectively, and the average value of the outputs of the 2 hall elements 54 may be obtained.
In the above configuration, for example, when the drive coil 46 disposed in the X direction is energized, an electromagnetic force (lorentz force) in the X direction acts on the drive magnet 44 to move the intermediate links 32a and 32c in the X direction. When the intermediate links 32a, 32c move in the X direction, the moving-body-side member 22 and the autofocus unit 12 are moved in the X direction by the 2 nd active links 36a, 36b, 36e, 36f having axes that are difficult to move in the X direction. The position of the moving-body-side member 22 in the X direction is detected by the hall element 54 provided in the X direction.
When the intermediate links 32a, 32c move in the X direction, the 1 st active links 34a, 34b, 34e, 34f have axes of easy movement in the X direction, and therefore only shaking occurs, and the fixed body side member 20 is not affected. When the movable body side member 22 moves in the X direction, the 2 nd active links 36c, 36d, 36g, and 36h have axes of easy movement in the X direction and therefore shake, but the 1 st active links 34c, 34d, 34g, and 34h have axes of hard movement in the X direction and therefore the intermediate links 32b and 32d do not move in the X direction and the Y direction. Therefore, the intermediate links 32b and 32d are not affected (interfered) by the operation of the intermediate links 32a and 32 c.
On the other hand, when a direct current drive current is applied to the drive coil 46 arranged in the Y direction, an electromagnetic force in the Y direction acts on the drive magnet 44, and the intermediate links 32b and 32d move in the Y direction. When the intermediate links 32b, 32d move in the Y direction, the moving-body-side member 22 and the autofocus unit 12 are moved in the Y direction by the 2 nd active links 36c, 36d, 36g, 36h having axes that are difficult to move in the X direction. The Y-direction position of the moving-body-side member 22 is detected by the hall element 54 provided in the Y-direction.
When the intermediate links 32b, 32d move in the Y direction, the 1 st active links 34c, 34d, 34g, 34h have easy axes in the Y direction, and therefore only sway occurs, and the fixed body side member 20 is not affected. When the moving-body-side member 22 moves in the Y direction, the 2 nd active links 36a, 36b, 36e, and 36f have easy-movement axes in the Y direction, and therefore sway occurs, but the 1 st active links 34a, 34b, 34e, and 34f have hard-movement axes in the Y direction, and therefore the intermediate links 32a and 32c do not move in the X direction and the Y direction. Therefore, the intermediate links 32a and 32c are not affected (interfered) by the operation of the intermediate links 32b and 32 d.
As described above, when moving the moving-body-side member 22 in the X direction or the Y direction, the moving-body-side member 22 can be prevented from rotating by only performing the linear motion in the X direction or the Y direction to stop the movement in the Y direction or the X direction. Therefore, the hall element 54 does not detect crosstalk and rotational vibration.
In this embodiment, as shown in fig. 3, the hall element is disposed in the vicinity of the driving coil 46, and is actually disposed inside the winding of the driving coil 46. The hall element 54 faces a position detection magnet that also serves as the drive magnet 44. Other predetermined alternating current flows through the driving coil 46 in a manner overlapping with the driving current. The alternating current has a fixed frequency and amplitude that are specified in advance. By the drive current and the alternating current, a drive magnetic field and an alternating magnetic field are generated around the drive coil 46. Therefore, the magnetic field of the position detection magnet serving as the drive magnet 44, the magnetic field generated by the drive current, and the magnetic field generated by the predetermined ac current act on the hall element 54. That is, in addition to the position signal generated by the magnetic field of the position detection magnet, a drive signal and an ac signal generated by the drive magnetic field and the ac magnetic field are output from the hall element 54.
Fig. 4 is a block diagram showing embodiment 1 of a position detection device 56 including a hall element 54.
The drive control circuit 58 inputs a drive input signal and an ac input signal to the drive circuit 60. The drive circuit 60 causes the drive current and a predetermined alternating current to flow through the drive coil 46 in an overlapping manner based on the drive input signal and the alternating current input signal from the drive control circuit 58. If the drive current and the alternating current are overlappingly passed through the drive coil 46, the drive magnetic field and the alternating magnetic field act on the hall element 54.
The hall element 54 has a bias current input terminal Hb and a hall voltage output terminal Ho. If the driving magnetic field and the alternating-current magnetic field act on the hall element 54, a driving output voltage corresponding to the driving magnetic field and an alternating-current output voltage corresponding to the alternating-current magnetic field are generated between the hall voltage terminals Ho. In addition, a position output voltage corresponding to the magnetic field of the position detection magnet is generated.
An amplifier 66 composed of an operational amplifier 62 and a resistor 64 is connected to the output side of the hall element 54. The drive output voltage and the ac output voltage of the hall element 54 are amplified by the amplifier 66 to form a drive signal and an ac signal. In addition, the position output voltage forms a position signal.
The output side of the amplifier 66 is divided and connected by a BAND pass filter (BAND PASS FILTER)68 and a LOW pass filter (LOW PASS FILTER) 70. Since the band-pass filter 68 passes only signals with a band frequency specified in advance, only ac signals are passed in this case. In addition, since the low-pass filter 70 passes only signals with a low frequency, only the drive signal and the position signal are passed in this case.
The drive signal and the position signal are not completely dc, and may have a frequency component of several hundred hertz. The superimposed alternating current is preferably in a high frequency band well above this frequency (of the drive signal and the position signal) in order to be able to be completely separated. In addition, when the frequency is in a high frequency band that is much higher than this frequency, the moving body-side member 22 on which the position detection magnet is mounted does not move with the ac current. In addition, since the drive signal is very weak compared to the position signal, the drive signal having passed through the low-pass filter 70 has little influence on the position signal, and the position signal is also actually formed.
The detector circuit 72 receives the ac signal output from the band-pass filter 68. The detector circuit 72 applies a standard voltage and converts the standard voltage into a direct current having a current value corresponding to the amplitude of the alternating current signal.
The variable amplification factor amplification circuit 74 includes an operational amplifier 76, a resistor 78, and the like, and adjusts the amplification factor of the dc current output from the detector circuit 72 and then amplifies (including decreases) the dc current. The dc current whose amplification is adjusted by the variable amplification circuit 74 is fed back as a bias current of the hall element 54.
That is, in order to form a closed loop of "hall element input-hall element output-band pass filter 68-detector circuit 72-variable amplification factor amplifier circuit 74-hall element input", in order to maintain a stable state of the amplitude of the ac signal input to detector circuit 72 in accordance with the standard voltage, the variable amplification factor amplifier circuit 74 performs an amplification or reduction operation to amplify or reduce the value of the bias current supplied to hall element 54.
In the above configuration, in order to move the moving body-side member 22 and to correct the movement of the moving body-side member 22, the driving coil 46 increases or decreases the amount of energization, and heat generation and heat release are repeated, so that a local temperature rise and fall occurs near the driving coil 46. Therefore, the hall element 54 undergoes temperature fluctuation, and the sensitivity to the magnetic field also changes.
However, as described above, since the ac signal is fed back to the bias current of the hall element 54 for the purpose of stabilizing the ac signal and the amplification factor is automatically controlled, the magnetic field sensitivity of the hall element 54 with respect to the ac magnetic field which is applied and has a fixed value is maintained stable, and the magnetic field sensitivity with respect to the movement of the drive magnet 44 (position detection magnet) is also maintained stable.
That is, if the sensitivity of the hall element 54 decreases, the bias current increases, and the detection sensitivity increases and remains stable. In addition, if the sensitivity of the hall element 54 increases, the bias current is suppressed, and the detection sensitivity decreases and remains stable. As a result, as the sensitivity of the hall element 54 increases and decreases, the relative movement amount between the driving coil 46 and the driving magnet 44 is corrected to be excessive or insufficient, and the driving coil can be moved to a correct position.
Fig. 5 is a block diagram showing embodiment 2 of a position detection device 56 having a hall element 54.
In embodiment 2, the bias current or bias voltage applied to the hall element 54 is kept stable by, for example, the operational amplifier 80 and the resistor 82. In addition, a variable amplification factor amplification circuit 74 is connected on the output side of the hall element 54.
As in the case of embodiment 1, the position signal, the drive signal, and the ac signal output from the variable amplification factor amplification circuit 74 are divided by the band-pass filter 68 and the low-pass filter 70, and then passed. The detection circuit 72 feeds back the ac signal having passed through the band-pass filter 68 to the variable amplification factor amplification circuit 74. The variable amplification factor amplifier circuit 74 adjusts the amplification factor so as to stabilize the ac output signal based on the fed-back ac signal. The position signal and the drive signal are passed through the low-pass filter 70, and the position signal is also substantially formed.
In embodiment 2, the same portions as those in embodiment 1 are denoted by the same reference numerals in fig. 5, and the description thereof is omitted.
In this specification, the position detection device 56 applied to the camera device 10 will be described, and the present invention is also applicable to other devices. For example, the present invention is applicable to the driving device 14 having the position detecting device 56 and the driving mechanism 18. The camera apparatus 10 having such a driving apparatus 14 can perform hand-shake compensation. Moreover, the temperature characteristics are good, and miniaturization can be achieved.
The drive magnet 44 also serves as a position detection magnet, but may be provided separately. The position detection device 56 may also be applied inside the autofocus unit 12. In this case, the lens driving device is one having a driving magnet 44, a driving coil 46 opposed to the driving magnet 44, and a lens support body in which the driving magnet 44 or the driving coil 46 is fixed and which supports the lens. The lens driving device includes a hall element 54 which moves relative to the position detection magnet simultaneously with the driving coil 46, a current supply circuit which is overlapped with the driving current and supplies a predetermined alternating current to the driving coil 46, and a control circuit which controls and stabilizes an alternating current signal of the hall element corresponding to the predetermined alternating current. The lens driving device can accurately and quickly adjust the position of the lens bracket in the optical axis direction. Moreover, the temperature characteristics are good, and miniaturization can be realized.
In addition to the camera device 10, it is also applicable to an optical device having an optical element through which light passes by reflection, refraction, transmission, or the like. In addition, the invention is applicable to electronic equipment such as mobile phones and smart phones.
[ NUMBER DEFINITION ]
10 photographic device
12 autofocus unit
20 fixing a body side member
22 moving body side member
44 drive magnet (position detection magnet)
46 drive coil
54 Hall element
56 position detecting device
68 band-pass filter
70 low-pass filter
72 wave detection circuit
74 variable amplification amplifier
Claims (10)
1. A position detection device is characterized by comprising:
a Hall element which moves together with the driving coil relative to the position detection magnet;
a current supply circuit that supplies a predetermined alternating current having a predetermined fixed frequency and amplitude in advance, which is superimposed on the drive current, to the drive coil; a magnetic field of the position detection magnet, a drive magnetic field generated by a drive current, and an alternating-current magnetic field generated by the predetermined alternating current act on the hall element, and a position signal generated by the magnetic field of the position detection magnet, a drive signal generated by the drive magnetic field and the alternating-current magnetic field, and an alternating-current signal are output from the hall element; and
a control circuit that can separate an alternating current signal output corresponding to an alternating current of a predetermined fixed frequency and amplitude from the signal output of the hall element and can separate a position signal output corresponding to a position signal generated by a magnetic field of the position detection magnet from the signal output of the hall element as a position signal of the position detection magnet; the control circuit is provided with a detection circuit, and the detection circuit inputs the separated alternating current signal and an external standard voltage; the control circuit can also control the amplitude of the alternating current signal input to the detection circuit to be a constant value according to the standard voltage; the control circuit outputs the separated position signal as a position signal of the position detection magnet.
2. The position detection device according to claim 1, characterized in that:
the control circuit outputs an alternating current signal according to the separated Hall element, and the amplitude of the alternating current signal input by the detector circuit is controlled to be a certain value, so that the bias current supplied to the Hall element is controlled.
3. The position detection device according to claim 1, characterized in that:
the control circuit outputs according to the separated alternating current signal of the Hall element, the amplitude of the alternating current signal input by the detection circuit is controlled to be a certain value, and the output voltage output by the Hall element is controlled.
4. The position detecting device according to any one of claims 1 to 3, characterized in that:
the control circuit separates the output of the alternating current signal from the signal output of the hall element and feeds back the separated output of the alternating current signal.
5. The position detection device according to claim 4, characterized in that:
the control circuit comprises a band-pass filter, a detection circuit and a variable amplification rate amplification circuit, wherein the signal output of the Hall element passes through the band-pass filter, so that an alternating current signal corresponding to an alternating current with fixed frequency and amplitude which is specified in advance is separated from the Hall element, and the separated alternating current signal is input into the detection circuit; further, the output of the detector circuit is fed back by the variable amplification factor amplifier circuit.
6. A drive device is characterized by comprising:
a drive magnet;
a drive coil facing the drive magnet;
a hall element that moves together with the drive coil relative to the position detection magnet;
a current supply circuit that supplies a predetermined alternating current having a predetermined fixed frequency and amplitude in advance, which is superimposed on the drive current, to the drive coil; a magnetic field of the position detection magnet, a drive magnetic field generated by a drive current, and an alternating-current magnetic field generated by the predetermined alternating current act on the hall element, and a position signal generated by the magnetic field of the position detection magnet, a drive signal generated by the drive magnetic field and the alternating-current magnetic field, and an alternating-current signal are output from the hall element; and
a control circuit that can separate an alternating current signal output corresponding to an alternating current of a predetermined fixed frequency and amplitude from the signal output of the hall element and can separate a position signal output corresponding to a position signal generated by a magnetic field of the position detection magnet from the signal output of the hall element as a position signal of the position detection magnet; the control circuit is provided with a detection circuit, and the detection circuit inputs the separated alternating current signal and an external standard voltage; the control circuit can also control the amplitude of the alternating current signal input to the detection circuit to be a constant value according to the standard voltage; the control circuit outputs the separated position signal as a position signal of the position detection magnet.
7. A lens driving device is characterized by comprising:
a drive magnet;
a drive coil facing the drive magnet;
a lens support body fixed relative to the drive magnet or the drive coil and supporting the lens
A hall element that moves together with the drive coil relative to the position detection magnet;
a current supply circuit that supplies a predetermined alternating current having a predetermined fixed frequency and amplitude in advance, which is superimposed on the drive current, to the drive coil; a magnetic field of the position detection magnet, a drive magnetic field generated by a drive current, and an alternating-current magnetic field generated by the predetermined alternating current act on the hall element, and a position signal generated by the magnetic field of the position detection magnet, a drive signal generated by the drive magnetic field and the alternating-current magnetic field, and an alternating-current signal are output from the hall element; and
a control circuit that can separate an alternating current signal output corresponding to an alternating current of a predetermined fixed frequency and amplitude from the signal output of the hall element and can separate a position signal output corresponding to a position signal generated by a magnetic field of the position detection magnet from the signal output of the hall element as a position signal of the position detection magnet; the control circuit is provided with a detection circuit, and the detection circuit inputs the separated alternating current signal and an external standard voltage; the control circuit can also control the amplitude of the alternating current signal input to the detection circuit to be a constant value according to the standard voltage; the control circuit outputs the separated position signal as a position signal of the position detection magnet.
8. An optical device is provided with:
a drive magnet;
a drive coil facing the drive magnet;
an optical element support body which supports an optical element and is fixed to the drive magnet or the drive coil;
a hall element that moves together with the drive coil relative to the position detection magnet;
a current supply circuit that supplies a predetermined alternating current having a predetermined fixed frequency and amplitude to the driving coil, superimposed on the driving current; a magnetic field of the position detection magnet, a drive magnetic field generated by a drive current, and an alternating-current magnetic field generated by the predetermined alternating current act on the hall element, and a position signal generated by the magnetic field of the position detection magnet, a drive signal generated by the drive magnetic field and the alternating-current magnetic field, and an alternating-current signal are output from the hall element; and
a control circuit that can separate an alternating current signal output corresponding to an alternating current of a predetermined fixed frequency and amplitude from the signal output of the hall element and can separate a position signal output corresponding to a position signal generated by a magnetic field of the position detection magnet from the signal output of the hall element as a position signal of the position detection magnet; the control circuit is provided with a detection circuit, and the detection circuit inputs the separated alternating current signal and an external standard voltage; the control circuit can also control the amplitude of the alternating current signal input to the detection circuit to be a constant value according to the standard voltage; the control circuit outputs the separated position signal as a position signal of the position detection magnet.
9. A photographic apparatus, characterized in that:
having a lens driving device as claimed in claim 7.
10. An electronic device, characterized in that:
having a camera device as claimed in claim 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896854.6A CN109579879B (en) | 2017-09-28 | 2017-09-28 | Position detection, drive, lens drive, optical, photographic device, and electronic apparatus |
| JP2018112165A JP6662955B2 (en) | 2017-09-28 | 2018-06-12 | Position detecting device, driving device, lens driving device, optical device, camera device, and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896854.6A CN109579879B (en) | 2017-09-28 | 2017-09-28 | Position detection, drive, lens drive, optical, photographic device, and electronic apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN109579879A CN109579879A (en) | 2019-04-05 |
| CN109579879B true CN109579879B (en) | 2021-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710896854.6A Active CN109579879B (en) | 2017-09-28 | 2017-09-28 | Position detection, drive, lens drive, optical, photographic device, and electronic apparatus |
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| Country | Link |
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| JP (1) | JP6662955B2 (en) |
| CN (1) | CN109579879B (en) |
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|---|---|---|---|---|
| CN111948873A (en) * | 2019-05-14 | 2020-11-17 | 新思考电机有限公司 | Driving device, camera module, electronic device and driving device assembling method |
| CN112146560B (en) * | 2019-06-26 | 2022-11-04 | 华为机器有限公司 | Optical device rotation angle detection method, rotation angle detection device and camera module |
| CN114295104A (en) * | 2020-09-22 | 2022-04-08 | 新思考电机有限公司 | Inclination detection device, camera device, and electronic apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100880672B1 (en) * | 2007-07-18 | 2009-02-02 | 자화전자 주식회사 | Camera System with Auto-Focus Function and Control Method thereof |
| US8084969B2 (en) * | 2007-10-01 | 2011-12-27 | Allegro Microsystems, Inc. | Hall-effect based linear motor controller |
| JP2012103497A (en) * | 2010-11-10 | 2012-05-31 | Rohm Co Ltd | Lens control apparatus and imaging apparatus using the same |
| JP2013033179A (en) * | 2011-07-29 | 2013-02-14 | Shicoh Engineering Co Ltd | Lens drive device, autofocus camera, and portable terminal device with camera |
| JP5715023B2 (en) * | 2011-10-12 | 2015-05-07 | 旭化成エレクトロニクス株式会社 | POSITION DETECTION DEVICE, POSITION DETECTION METHOD, AND ELECTRONIC DEVICE USING THE SAME |
| JP2013205550A (en) * | 2012-03-28 | 2013-10-07 | Olympus Corp | Position detection device and position control device |
| CN103454749B (en) * | 2013-08-29 | 2016-09-07 | 上海比路电子有限公司 | A kind of closed loop lens drive motor |
| JP6500394B2 (en) * | 2014-11-12 | 2019-04-17 | リコーイメージング株式会社 | Imaging apparatus, imaging method and program |
| KR101709854B1 (en) * | 2015-05-28 | 2017-02-23 | 삼성전기주식회사 | Actuator driving apparatus, camera module, electronic apparatus and controlling method for actuator driving |
| JP2017037231A (en) * | 2015-08-11 | 2017-02-16 | 惠州市大亜湾永昶電子工業有限公司 | Lens drive device |
| JP6672656B2 (en) * | 2015-09-15 | 2020-03-25 | リコーイメージング株式会社 | Position detecting device and optical device |
| CN206618891U (en) * | 2017-01-12 | 2017-11-07 | 新思考电机有限公司 | Lens driver and the photographic means and electronic equipment for possessing it |
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2017
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| JP6662955B2 (en) | 2020-03-11 |
| JP2019066820A (en) | 2019-04-25 |
| CN109579879A (en) | 2019-04-05 |
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